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nitll JAMES DAVENPORT WHELPLEY AND JACOB JONES STOEER, 'OF BOSTON,

. MASSACHUSETTS;

Letters Patent No. 103,804, dated May 31, 1870.

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IMPROVEMENT IN FBEDING PULVERIZED FUEL TO METALLURGC AND OTHER FUR; NACES.

The Schedule referred to in these Letters Patent and making par: of the same To all to whom these presents shall come:

Be it known that we, JAMES DAVENPORT Wilma- LEY and JACOB J ones S'ronnn, both of Boston, in the State of Massachusetts, have invented an Improvement in Mechanism for Feeding Pulver-ized Fuel'to Metallurgie and other Furnaces and Fire-Boxes, which ther following specification and accompanying drawings sufficiently describe.

If broken coal he introduced'into a common segmental fan-blower, lthe revolutions of the fans or paddies will cause it to be reduced to still finer particles, and thrown on a current of air out of the peripheral opening in the fan-case. The diameter of the case and the velocity of the fans will, other conditions being equal, determine the degree of the reduction of the coal, but in any event only a small portion, say, ten to twenty per cent.'o i` the coal ejected, \vill.be line enough foruse in our methods of burning pnlverized fuel. v

It being desirable to4 rise simple and inexpensive machines for our process, for pulverizing and introducing fuel into fire-boxes, we have adopted among other devices the common segmental fan-blower, with certain modifications and attachments, as shown inv the drawings annexed, in order to procure a more thorough pnlverization ofthe material before delivery into the fire-box..

Figure l is a vertical section.

Figure 2, an end section.

Figures 3 and 4, an improved form ofpnddlc or fan.

A. is the fan-case, representing a segment of a hnllow cylinder.

B, the shaft carrying fans or paddles p p p.

At G is an opening iu the periphery ofthe ian-ease. y

D is a chamber built over the peripheral opening.

W is a diaphragnroi' wire-gauze.

E is a hole in the chamber, to which is .attached the pipe K, through which the linely-pulverized coal passes to the fire-box.

H is thefeedhopper at the side of' the fan-cas,e.

'Coal being fed into the hopper falls into the faucase, and is quickly broken by the revolving fans, and projected on a blast of air into the chamber D. The iinely-pulverized coal is carried by the escaping air out or the hole at F, and through thc pipe K, while the coarser material falls back into the fan-case by its superior weight, to be again subjected to the ac-v tion of the fans or paddles.

The feed of air and coal into the fan-casc is regulated by a slide or valrc, V, or any other analogous' arrangement..

This device is new only in its application to the purpose specified.

April 22, 185i, Jehu Hollingsworth patentel a smut-mill and wheat-scourer, which was a segment of a cylinder inwhich were revolvingr fans or paddles. This `case was open at the top along the wholclength, and a chimney or chamber was iittedclose to this opening. His claim wasv throwing up the grain onto ...the inclined vface ofthe chimney, iitted to an openingr along the top of the concave. The grain to be cleaned was fed into the cylinder and thrown by the paddles aga-inst the face of the chimney, whence it returned into the fan-case to he further acted upon, while the dust, smut, Sto., 'were carried by the current of air through the top of the chimney. In Hollingsworths reissue of October 10, 1854, he says:

i There is a principle involved in the operation of my machine which, to the best of my knowledge, has never before been known or practiced, viz., that of scouring within a cylinder or concave, and throwing the whole mass out of the machine, as it were, when the actual separation takes place, the impurities passing ont and the grain returning back again for a similar operation.77

This device of Hollingsworth, while it describes the general principles of our machine, and is useful for scouring grain and seeds, is not applicable to the pur poses ol' our inLation, viz., to that of simnlianeonsly pulverizing and feeding coal into furnaces and fireboxcs. In fact, the alterations and additions we' have made to the machine so essentially modify it vas to give it thc character of a new machine.

Hollingworthsmachine has large openingsY in both ends for the admission of air, which openings are covered by Wire-gauze to prevent the grain 'boundingout In our machine We dispensel with these openings, and use only a small opening in one side of the machine near the shaft, two or three inches in diameter, fitted with a hopper and valve for nearly complete closure. The work which wc'proposc to do requires a very small admissionof air.

Tho grain, being fed in at one endof Hollingsworthis machine, is immediately thrown into the chim ney by the actionof the fan, and, falling back upon an inclined apron, is guided by it again into the cylinder at a point several inches in advance of that of its lirstentrancc, so it is repeatedly throw pout and guided hack by the aprons until it reaches the discharging' end, whence the last apron guides itinto the discharging-hopper. We entirely dispense with these aprons and with the discherging-hopper, desiring all the coarse material fed into our mili to fall back from the chamloer, and to he cmstantly acted npooby the whole length of the paddles until reduced to line powder; and desiring to have r thing but 'nnc powder iinally discharged. v

Hollingsworth makes his chimney smaller at the grain would be broken and pulvei'izcd, the blast of air from his machine must be somewhat faint; hence he requires a conical chimney, in order that the blast may retain `suiiicient velocity to effect the desired. purose. l p For the purpose` of pnlvelzing coal and simultaue onsly feeding it into fixe-boxes, ,We'give our fans a velocity of from eighteen hundred to three thousand revolutions er minute, and instead of making a chimney of Luc s ape of Hollingsworths, and entirely7 open at the top, we erect over the opening in the periphery of the fan-case a collecting and returuing-chamber, expanding upward, ,so that the upward current of air shall lose its velocit-y suciently fot` coarse particles to fall out of it, whilethe ne dust only shall escape'` ber into two chambers, by a horizontal diaphragm of wire-gauze, in' order to make sure that no'pa'rticles rior surface of the ian-case. ID Qur machine, the lnterior ofthe pulverizing-chamber mus't be perfectly smooth. All projections or roughness ten-d to impair the action of the mill. And we have also devised other styles than his oi'tfans or paddles. Figs. 3 and 4 show a paddle with equal sides andvcrenated edges, fastened to the arm by a bolt with square shank or shoulder, fitting into a square or slotted hole in the paddle andv arm. t

The 'advantages of this design are threefold: Ouc bolt suffices to keep the paddle in place, so that it cannot turn or swivel, and, as thc paddles have four equal edges, wercan turn each edge toward the periphery as the others become worn, and the teeth multiply and make morev violent the turbines of air created by the revolutions of thc fau; and these greatly increase in a given time the percentage of flue pulverization of material. What we claim, and desireto secure by Letters Patent, is

1. The use and application of thewithin-described mechanism for the purposes described.

2. The paddle or fan, with crenatcd or indented edges, and reversible on a-single, bolt for p'ulverizingfans and mills.

chamber, expanded upward and covered at the top, and the wire-gauze diaphragm therein, in combination with the cylinder or fan-case, substantially as described.

` JACOBJ. S'lOltEll. Witnesses:

EUWARD RENOUF, f CHARLES)'LNIcKERsoN.

3. The above-described,collecting and returning 

